HydroBASINS lev08 watershed · #4081156550
Bassin de Eriga_Oya_Canals
A watershed (drainage basin) is not a body of water — it is the land area where rainfall converges towards a single river that eventually reaches the sea (or an endorheic basin). Boundaries follow ridgelines.
Crosses 9 administrative regions : Dambulla, Elahera, Galenbindunuwewa, Hingurakgoda, Horowpothana +4
Sub-basin area
1 185,4km²
Upstream area
1 185,4km²
Discharge
21,63m³/s
Mean elev.
99m
Administrative coverage
Hydrographic chain
▼ Drains into
▲ Receives from 0 basins
Source / headwater (no upstream basin)
9 dept-equivalent regions (GADM L2)
- 658.7 km²55.8% of basin
- 241.0 km²20.4% of basin
- 111.5 km²9.4% of basin
- 67.3 km²5.7% of basin
- 63.7 km²5.4% of basin
- 31.0 km²2.6% of basin
- 5.2 km²0.4% of basin
- 1.7 km²0.1% of basin
1 moreFull L2 list
- Galenbindunuwewa0.3 km² · 0.0%
25 intersecting protected areas
Hurulu Forest Reserve
IUCN Not ApplicableUNESCO-MAB Biosphere Reserve
174.33 km² overlap
Hurulu
IUCN IaConservation Forest
167.42 km² overlap
Talapathkanda
IUCN IbReserved Forest
99.16 km² overlap
Minneriya
IUCN IINational Park
85.69 km² overlap
Nature Reserve
62.82 km² overlap
Minneriya - Giritale
IUCN IVSanctuary
59.39 km² overlap
Kaudulla
IUCN IINational Park
55.74 km² overlap
Aluthoya
IUCN IbReserved Forest
37.60 km² overlap
Somawatiya Chaithya
IUCN IINational Park
28.54 km² overlap
16 more protected areassorted by overlap area
Nature Reserve
26.80 km² overlap
Minneriya-Giritale Section I
IUCN IVNature Reserve
17.69 km² overlap
Flood Plains
IUCN IINational Park
15.43 km² overlap
Anawulandawa
IUCN IaConservation Forest
13.82 km² overlap
Sigiriya
IUCN IVSanctuary
11.64 km² overlap
Ratmale
IUCN IbReserved Forest
11.11 km² overlap
Kelegama
IUCN IbReserved Forest
11.00 km² overlap
Elahera
IUCN IbReserved Forest
6.56 km² overlap
Moragaswewa
IUCN IbReserved Forest
6.21 km² overlap
Angunawelapelessa
IUCN IbReserved Forest
5.87 km² overlap
Giritale
IUCN IbReserved Forest
3.50 km² overlap
Ralapanawa
IUCN IbReserved Forest
3.40 km² overlap
Polonnaruwa
IUCN IVSanctuary
3.11 km² overlap
Unagollewa
IUCN IbReserved Forest
2.00 km² overlap
Hurulu/Konwewa
IUCN IbReserved Forest
0.80 km² overlap
Muwanpalassakele
IUCN IaConservation Forest
0.05 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
750 distinct species · 18 271 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 33 species (selected proportionally per kingdom among those with at least one documented interaction here) to keep the graph readable. Hover for details, click to explore the full ecosystem of a species.
ℹ️ The territory contains many more species than displayed and all their documented interactions: the graph is intentionally the structural skeleton (top-N species by composite local score, edges filtered by Serrano 2009 disparity filter α=0.2).
Indicateurs du tissu écologique
Tissu écologique de Bassin de Eriga_Oya_Canals : 29 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 24 interactions GloBI sur 3 types (connectance 4.5%, filtre Serrano α=0.2). 4 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
27,1°C
Annual rain
1 567mm
Moisture idx (CMI)
0,02
Runoff
604mm/an
PET
1 534mm
AET
1 051mm
Mean slope
1,8°
Water table
94cm
Forest
45%
Crops
21%
Urban
11%
Protected
81%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)